Is it cold to travel in Qinghai Plateau in the cold winter?

When traveling to Qinghai Plateau in the cold winter, it is definitely cold in some places above 3, meters above sea level, especially above 4, meters above sea level, so it is necessary to wear thick winter clothes.

For example, during the National Day of 217, when I was on the Qinghai-Tibet Plateau in go on road trip, it was already a few degrees below zero during the day and a dozen degrees below zero at night.